IGMP Snooping Commands
33-5
33
Command Mode
Interface Configuration (VLAN)
Command Usage
• If immediate-leave is not used, a multicast router (or querier) will send a
group-specific query message when an IGMPv2/v3 group leave message is
received. The router/querier stops forwarding traffic for that group only if no
host replies to the query within the specified timeout period. Note that the
timeout period is determined by the ip igmp snooping
query-max-response-time (see page 33-8).
• If immediate-leave is enabled, the switch assumes that only one host is
connected to the interface. Therefore, immediate leave should only be
enabled on an interface if it is connected to only one IGMP-enabled device,
either a service host or a neighbor running IGMP snooping.
• This command is only effective if IGMP snooping is enabled, and IGMPv2 or
IGMPv3 snooping is used.
Example
The following shows how to enable immediate leave.
show ip igmp snooping
This command shows the IGMP snooping configuration.
Default Setting
None
Command Mode
Privileged Exec
Command Usage
See “Configuring IGMP Snooping and Query Parameters” on page 15-3 for a
description of the displayed items.
Example
The following shows the current IGMP snooping configuration:
Console(config)#interface vlan 1
Console(config-if)#ip igmp snooping immediate-leave
Console(config-if)#
Console#show ip igmp snooping
Service status: Enabled
Querier status: Disabled
Leave proxy status: Enabled
Query count: 2
Query interval: 125 sec
Query max response time: 10 sec
Router port expire time: 300 sec
Immediate Leave Processing: Enabled on VLAN 1,
IGMP snooping version: Version 2
Console#
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